<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>02.class实现单例模式</title>
  </head>
  <body>
    <script>
      // 将单例对象直接挂载在类本体上，以实现单例模式
      class Singleton {
        constructor(name, age) {
          if (!Singleton.instance) {
            this.name = name;
            this.age = age;
            Singleton.instance = this;
          }
          return Singleton.instance;
        }
      }
    </script>
  </body>
</html>
